As for buying one in NYC? I dont think any store sells them here. There is a store out in Conn. that is a dealer for Daddymojo cbgs, $$$$$$$. Try and build one yourself, it will be much more satisfying. tons of video's on youtube and all the info you'll need here. Your in Manhattan? Stop by the outdoor flea market on 79th and Columbus, there is a couple from Long Island that always have nice cigarbox's to pick from. I got a few already from them.
id recommend just asking any deli that sells cigars.
i get my boxes for a dollar each at a deli near my house. I'm sure you could find one in your area.
as far as playing goes, i busk in the subways in manhattan sometimes with my friend.
I put a few up on consignment in small shops in Brooklyn, but don't think I have anything at the moment in stores. Mostly I sell direct to consumer in the 5 boroughs and Westchester. Feel free to contact me if you'd like to discuss a custom build